/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.runners.fnexecution.environment;



import net.jcip.annotations.ThreadSafe;

import com.bff.gaia.unified.model.pipeline.v1.RunnerApi.Environment;

import com.bff.gaia.unified.runners.fnexecution.control.InstructionRequestHandler;



/** A {@link RemoteEnvironment} that connects to Dataflow runner harness. */

@ThreadSafe

public class StaticRemoteEnvironment implements RemoteEnvironment {



  static StaticRemoteEnvironment create(

      Environment environment, InstructionRequestHandler instructionRequestHandler) {

    return new StaticRemoteEnvironment(environment, instructionRequestHandler);

  }



  private final Environment environment;

  private final InstructionRequestHandler instructionRequestHandler;



  private boolean isClosed = false;



  private StaticRemoteEnvironment(

      Environment environment, InstructionRequestHandler instructionRequestHandler) {

    this.environment = environment;

    this.instructionRequestHandler = instructionRequestHandler;

  }



  @Override

  public Environment getEnvironment() {

    return this.environment;

  }



  @Override

  public InstructionRequestHandler getInstructionRequestHandler() {

    return this.instructionRequestHandler;

  }



  @Override

  public synchronized void close() throws Exception {

    // The instruction handler should each only be terminated once.

    // Do nothing if we have already requested termination.

    if (!isClosed) {

      return;

    }

    isClosed = true;

    this.instructionRequestHandler.close();

  }

}